Flour sieve and LIGO: what they have in common

1. Step 1. Flour sieve — is part of — Gristmill. It separates flour from bran.
2. Step 2. Gristmill — uses — Water wheel. A water wheel turns the millstones.
3. Step 3. Water wheel — uses — Gravity flow. Falling or flowing water turns the wheel.
4. Step 4. Gravity flow — is used in — Water filter. Water seeps through by gravity.
5. Step 5. Water filter — is made of — Silica (sand). Slow filters are layers of sand and gravel.
6. Step 6. Silica (sand) — is material for — LIGO. The mirrors are fused silica.

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